Ceramic coating keeps more heat and changes the thickness of the pipe in turn changing how it works. Ceramic coatings aren't a bad thing but require a very different design and engine set up. From my testing you can chrome, nickel or paint most atv pipes without any loss in power but I've personally tested ceramic coated pipes and see huge losses in usable power.

Why the heck would Aaen want to Ceramic Coat there products then?